Mig Brazing

[kencombs]

I buried this question in Los-control's door thread.  Thought I'd give it a post of its own to get more views/info,

 

I've been wanting to try mig brazing, but needing another gas bottle and expensive wire has kept me from trying out out.

It seems to be an ideal method for sheet metal or thick to thin applications like this one.

Some carmakers now specify it for body repairs in certain areas.

 

Has anyone here tried it?  If so , did you spring for the pure argon bottle, or try it with 25/75 mix.

 

Edited June 22, 2021 by kencombs

[Plymouthy Adams]

Never have brazed outside using the oxy/acetylene torch....I would think the needed heat to the substrate before application of the filler rod would place this a bit more difficult with a MIG welder....I would think preheating would be necessary.

[kencombs]

No preheat required as far as I can tell from the info I’ve found.    
And no flux which is a problem under body work if not cleaned completely. That and low heat and distortion really interest me as I am working on some rust repairs. 

recommended by gm bmw  and others and used as a plug weld a lot.  

Edited June 22, 2021 by kencombs

[Plymouthy Adams]

I do not think I have not so much as turned on the MIG welded in years....just not my go to machine.....I will stay old school with the torch I suppose....be interesting as you say to see if someone here does this and how it works...as with mig welding steel especially on dissimilar metal thickness and thinning where punch through due to sudden excess heat...just not my go to and of course there is the other factors associated with MIG .....you are right about the brazing flux will grow hair.....has to be spotlessly cleaned before coating....European cars have always had a fair share of brazing in the process of auto making....makes for no fun time when repairing later and you wish to get rid of the brazing media completely....

[Sniper]

I didn't even know mig brazing was a thing till I was watching some Utube videos by This Old Tony earlier today.  In mentioned it in passing.

 

I might get onto this myself so I'll be watching.

[maddmaxx1949]

This Old Tony's channel is a darn encyclopedia for things like that. Absolutely fantastic. Have learned an absolute ton from them, guess now I have to go check out mig brazing.